a large（great,good）amount of ＋不可数名词,谓语动词一般用单数；
但（huge,great,good）amounts of ＋ 不可数名词,作主语时,谓语动词要用复数.
A large amount of damage ＜has been＞done by the earth quake．
Large amounts of money ＜were＞spent on the bridge．